Construction of aerial impellers, propellers, or fans.



2 SHEETS-SHEET I.

' fave/ Tor Ec/w rd 006(5017 E DODSON CONSTRUCTION OF AERIAL IMPELLERS, PROPELLERS, 0R FANS.

APPLICATION men luLvn. 1915. 1 ,1 84,1 68. Patented May 23, 1916.

E. DODSON.

CONSTRUCTION OF AERIAL IMPELLERS, PROPELL ERS, 0R FANS.

Patented May 23,1916.

APPLICATION FILED JULYIT, 1915. 1,184,168.

2 SHEETS-SHEET 2.

v To all whom it may concern the two ring bosses.

EDWARD DODSON, OF DEAL, ENGIAND.

O ONSTRUCTION OF AERIAL IMPELLEBS, 'PROPELLERS, QR FANS.

Specification of Letters Patent.

Patented May 23,1916.

Application filed July 17 1915. Serial N 0. 40,379.

Be it known that I, EDWARD DODSON, subjectof the King of Great Britain, residing at No. 24 Queen street, Deal, in the county of Kent, England, have invented new and useful Improvements in the Construction of Aerial Im ellers, Propellers, or Fans, of which the ollowing is a specification.

' This inventionrelates to improvements in the construction of aerial impellers, for use either as aerial propellers for propelling bodies through air, or as fans, such as are employed for creating a draft of air through the radiators of motor cars, and for other purposes.

According to the invention, the propeller or fan is built up of stampmgs from sheet metal, each'stamping bein in the shape of a propeller blade with a lvided ring at its inner end, the portions of which ring at each edge of the blade being bent into dif ferent but approximately parallel planes so that the assembled-fan has a ring boss in front and behind built up by the respective portions of the divided rin ofthe blades, and interconnected by the oblique blades. The blades are secured in correct angular position by bolts passing through holes in A fan and an aerial propeller constructed according to the invention are illustrated on the accompanying drawing, in which Figure 1 is a front elevation of a stamped blade for a fan before being bent. Fig. 2 is a front elevation of the stamped blade after being bent, .and Fig. 3 is a corresponding plan. Fig. 4 shows a plurality of stamped and bent blades, nested together preparatory to bein mounted on a shaft or sleeve. Fig. 5 is a ront elevation, and Fig. 6 is a side elevation, one blade being in section taken along the line 66 of Fig. 5, showing four blades assembled and mounted on a sleeve. Fig. 7 is a front elevation of a finished blade for an aerial propeller. Fig. 8 is a transverse section taken along the line 8-8 of Fig. 7, and Fig. 9 is a transverse section taken along the line 99 of Fig. 7.

Referring to. Fig. 1:-a is a blade for a fan stamped from a sheet of metal, having a ring portion 6 at its narrow end, divided at b at a situation remote from the blade a,

and with an oval aperture or'eye', the major axis of which eye is transverse to the blade a. As shown in Figs. 2 and 3, the two portions of the ring I) are bent into. different but more-or less parallel planes, so as to form incomplete ring bosses at each edge of the blade a. At the same time the eye is contracted to a circle so that the ends of the incomplete ring bosses b overlap.

A number of the blades a With their incomplete ring bosses I) are nested together, as shown in Fig. 4, wherein -'-four are illustrated, and are then threaded on a shaft or sleeve 9, Figs. 5 and 6. After being mounted on the sleeve 0, the blades a are separated angular-1y to equal distances apart, the root of each blade being overlapped in .front and behind by the incomplete ring bosses b of the next blades, whereby the incomplete ring bosses I), together form complete rlng bosses in front of and behind the fan, as shown in Figs. 5 and 6. The blades are then secured in correct relative angular position and also are secured to a flange d of the sleeve 0, by means of bolts 6, which are threaded through holes in the flange (Z and through holes, previously formed in appropriate positions in the ring boss portions 6 to coincide when assembled, and the bolts are secured by -nuts f.

In a blade for an aerial propeller it is more important than in a blade for a fan, that both the front and rear surfaces of the blade conform to the contour found most appropriate for actin upon the air. For this reason the blade or an aerial propeller shown in Figs. 7-9 is built up of a pair of stampings, one (t bein'g appropriately? bent to provide the front surface, and the other a being appropriately bent to provide the rear 'surface. The leading and trailing edges of the stampings 0, and a are riveted together. As, however, an undesirable hollow would be left alongside the leading edge of the front surface a, a strip of metal 9 is riveted between the leading edges of a. and a and With a fan or aerial propeller constructed as above described, broken or deforme blades can easily be renewed. s

The metal from which the blades and inserted pieces are stamped is preferably sheet aluminium, which material is harder and more durable than cast aluminium, but the blades may be stampings of other metals or alloys, such as steel.

I claim: 1. In an'aerial impeller, a blade stamped and bent from sheet metal and an incomplete ring boss at .both the leading and trailing edges of said blade- 2. In an aerial impeller,'a blade stamped and bent from sheet metal and an, incomplete ring boss at both the leading andtrailing edges of said blade, said incomplete boss' and between the leading edgesof said stampings and bent over the front of said blade and a portion of a ring boss at both the leading and trailing edges of said blade.

5. In an aerial propeller, a blade composed of a pair of bent'stampings from sheet metal secured together at their leading and trailing edges, a strip of sheet metal secured between the leading edges of said 'stampings and bent over the front of said blade and a portion of a ring boss at both .the leading and trailing edges of said blade, said boss portions being approximately parallel and their ends overlapping.

6. In an aerial propeller, a plurality of blades each composed of a pair of bent stampings fromsheet metal, secured together at their leading and trailing edges, a strip of sheet metal secured between the leading edges of each said pair of stampings and bent over the front of each said blade, a portion of a ring boss at both the leading and trailing edges of each said blade, assembled into approximately parallel complete ring bosses at'thefront and rear of said aerial propeller.

7. A stamping for an aerial impeller, consisting of a portion stamped to the developed profile of a blade and at the inner.

end of said blade-shaped portion a divided ring portion with an oval aperture the major axis of which is transverse to said bladeshaped portion.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EDWARD DODSON. l/Vitnesses:

ROBERT ARTHUR SMITH, D. E. BRETTELL. 

